What would it mean if 9/11 was indeed an "inside job"

Here we are nine years later and there are still many questions yet unanswered about 9/11 - worst yet there are questions that, for some reason, remain unasked. However, what if it were true? Suspend your belief or disbelief for a few minutes and ask yourself that question. What if 9/11 was planned and pulled off by criminal elements within our own government? What would that mean? What would we do? What exactly is implied? What would it mean to the Department of Homeland Security? Would that go away? How about the Patriot Act and all the presidential orders that followed it? Would it affect our current president? It's a tough question to ask and an even harder one to consider.